Safety-door for elevators.



PATENTED JUNE 9, 1908.

J. KREHBIEL. SAFETY DOOR FOR ELEVATORS.

'APPLIUATIOTI TILED JULY 31, 1907.

3 0 9 0 IA 1 m 1 1 mm m INVENTOR WITNESSES:

THE "cams PETERS co; wasnmmon, n. c.

UNITED STATES PATENT OFFICE.

JOHN KREHBIEL, OF DETROIT, MICHIGAN.

SAFETY-DOOR FOR ELEVATORS.

To all whom it may concern:

Be it known that I, JOHN KREHBIEL, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Safety- Doors for Elevators, of which the following is a specification, reference being had therein to the accompanying drawings.

In the operation of a passenger elevator, it

1 is ordinary practice for the conductor to open the car door as he is approaching a landing and thereafter shift the car up and down to bring its floor to the proper level; the car is also often started before the door is closed, both practices frequently resulting in injury to persons attempting to leave the car.

This invention relates to safety mechanism for an elevator which automatically prevents the opening of the exit while the car is moving and likewise holds the car stationary as long as its door is open.

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

Referring to the drawings, Figure 1 is a view of the interior of a portion of an elevator shaft and a car, provided with a device embodying the features of the invention, showing the car at a landing with the motive power cut off, and the door free to be opened. Fig. 2 is a view of the outer or shaft side of a car door. Fig. 3 is a view in vertical section on or about line AA of Fig. 1, of the front Wall of a car. Fig. 4 is a view in detail of a pair of interlocking door plates and a latch lever.

In general terms, the device is an interlocking mechanism between the shaft door, cardoor and the manually operated controller by which the hoisting apparatus is started, stopped and reversed.

In the drawings, 1 indicates a shaft interior having the usual landings and shaft doors 2 in vertical alinement when closed, supported in any preferred manner to slide or move lat' erally, as by hangers 3 rolling on an overhead track 4. Each of these doors has a gravity or spring-latch of any approved type that may be operatively connected to a lever 5 pivoted so that one arm 6 oscillates laterally between a pair of short vertical flanges 7 and 8 of a plate on the inner side of the door, the latch being locked when the lever arm is toward the outer flange 7, and all the parts being inaccessible from the landing. As herein Specification of Letters Patent.

Application filed July 31, 1907.

Patented June 9, 1908.

Serial No. 386,339.

is suspended or supported by any suitable hoisting mechanism (not shown) between vertical guides 16. A trip plate 17 is secured on the outer or shaft side of the car door with a pair of vertical flanges 18 which are adapted to pass between the corresponding flanges 7 and 8 of the shaft doors, as the car moves up or down the shaft, and to lie between them when the car is at a landing, embracing a roller pin 19 on the lever arm 6. There is suficient lateral play between the flanges so that the drawing back of the car door first oscillates the lever to trip or release the latch, and then opens the shaft door. Inasmuch as it is diflicult to bring a car to exactly the same position at all times, the trip plate flanges 18 are of sufficient length to give some range within which to stop the car and still to engage the latch lever and its door plate.

A segmental plate or sector 20 is pivoted at its corner to swing in a vertical plane on the car wall so that the door slides over it when opened, and is operatively connected to the car starting or controlling handle, wheel or lever, in such relation that when the controller is in its shut-off or neutral position, the upper rectilinear margin 21 is horizontal and the curved margin 22 just clears a suitable stop-block 23 on the door, allowing the latter to be opened, a stop-pin 2.4 on the sec tor underrunning a ledge 25 on the door when the latter is pulled back, and locking the sector and consequently the controller. If the door be closed, and the stop-pin cleared, the movement of the controller from its neutral position swings the curved edge of the sector up into the path of the stop block 23, and locks the door as long as the controller is not at theshut-off point. As herein shown, a controlling lever 26 of an electric hoist is di rectly connected to the sector and turns the latter as it traverses contact points 27 in the usual manner. Obviously, any other form of controlling lever, wheel or handle for any type of hoist may be used and may be placed as referred in the car, with any well known rec ucing and translating mechanism connecting it with the sector so as to impart the I desired motion to the latter. i

By this arrangement and disposition of 1 parts, the operator is compelled to stop his car and shut off the power completely before I he canopenthe car door. If the car is in proper register with a landing, the shaft door is opened. If not properly placed, the car i cannot be moved until the car-door is closed and the controller unlocked. If the car is! lodged between floors, through failure of the hoist or accident, the car door can be opened, l afterthe power is shut off, and the nearest shaft door reached from within and pushed back. Anyone can. thus safely pass out, for the car cannot be moved so long as the car door is open and the controller locked. The device is simple and may be readily adjusted to any elevator, and does not complicate the running or controlling mechanism.

Any effective form of latch. tripping and. interlocking device between the car and shaft doors may be used, although the one shown is preferable.

It is obvious that the details and construction of the parts may be varied without departing from the spirit of the invention, and I do not care to limit myself to any particular form or arrangement of parts.

What I claim as my inventionisz 1. The combination with an elevator shaft, self-latching, closures therein, a car operated. in the shaft by a hoist, a controller in the car for the hoist, and an exit closure in the car, of automatic means interlocking the car and. exit closures when the car is at a shaft landing, adapted to unlatch and. open the shaft closure when the car .closure is opened, and automatic means adapted to hold the carclosure shut when the controller is in operative position. and. to lock the controller in its neutral position when the car closure is opened.

2. In an elevator car, a controller, a door, a locking member connected to the controller, a stop on the door that is engaged by the locking member when. the door is closed. and the controller in operative position, and a stop-pin on the member that is engaged by the door when the latter is opened and the controller in neutral position.

3. In an elevator car, a controller, a door, a locking member moving with the con troller, a stop on the door engaged by the member when the door is closed and the controller in operative position, a stop-pin on the member and a ledge on the door engaging the stop pin when the door is open.

4. In an elevator car, a slide door, a stop on the rear margin thereof, a controller, a plate pivoted on the car and connected to 1 the controller, that engages the stop when the controller is in operative position, a ledge on the door, and a stop-pin on the plate engaged by the ledge when the door is opened.

5. In an elevator car, a controller, a sliding door, a stop thereon, a locking plate pivoted to the car in rear of the stopwhen the door is closed, adapted to be moved by the controller into the path of the stop when the controller is in operative position and to clear the stop when the controller is in neutral position, a ledge on the door, and a stoppin on the plate over which theledge slides when the door is opened.

6. In an elevator car, a controller, a slid.- ing door, a stop thereon, a segmental locking plate connected to the controller and pivoted to the car in the plane of the stop, its upper margin lying below the stop when the controller is in neutral position and its curved margin abutting the stop when the controller is in operative position, a stop-pin on the plate and a ledge on the floor adapted to slide over the pin when the door is opened.

7. The combination with an elevator shaft, self-latching exit doors therein, a car, a door therein, and interlocking means on the exit and car doors adapted to unlock the exit doors when the said doors are in register, of a car controller, a plate pivoted on the car and connected to the controller, a stop secured on the door which the plate engages when the controller is in operative position, a stop-pin on the plate and a ledge on the door adapted to engage the pin when the plate releases the stop andv the door is opened.

8. In an elevator, the combination with a car,a slide door therein, a controller, and means adapted to automatically lock the car door when the controller is in operative posi tion, and to release the door when the controller is in neutral position and lock the controller in said position when the door is opened, of shaft exit slide doors adapted each to register with the car door, a vertically flanged guard plate on each exit door, a lever adapted to trip the door latch, one of whose arms is oscillatory between the guard plate flanges, a stud on the arm, and a tripplate on the car door having vertical flanges adapted to lie between the guard plate flanges and engage the stud when the doors are in register and to oscillate the stud and lever when. the car door is opened.

In testimony whereof I affix my signature in presence of. two witnesses.

JOHN KREHBIEL.

\Vitnesses: g

O'r'ro F. BARTHEL, ANNA M. Donn. 

